2-Mercaptobenzothiazole manganese zinc, preparation method therefor and application thereof

Abstract

The present invention belongs to the technical field of agricultural fungicides and discloses a 2-mercaptobenzothiazole manganese zinc, preparation method therefor and application thereof. The chemical structure of the 2-mercaptobenzothiazole manganese zinc is shown as the above formula. Wherein m, n and n′ are positive integers, m=2(n+n′), n≧n′, n:n′=1:1˜9:1. Materials are prepared according to the stoichiometric ratio of the target products; 2-mercaptobenzothiazole is dissolved in sodium hydroxide solution. The aqueous solution of water-soluble manganese salts and water-soluble zinc salts solution are successively added to 2-mercaptobenzothiazole sodium solution under stirring, followed by stirring for mixing well, then the solution being allowed to stand, filtered and washed with water to obtain filter cake, and then dried in vacuum to obtain 2-mercaptobenzothiazole manganese zinc. The present 2-mercaptobenzothiazole manganese zinc may be used as an agricultural fungicide. The present invention coordinates the surface of solid particles of 2-mercaptobenzothiazole manganese with zinc to form a stable clathrate of 2-mercaptobenzothiazole manganese and zinc. Tests show that the clathrate has excellent effect for controlling a plurality of diseases including apple alternaria leaf spot, pear scab, apple ring rot, apple anthracnose and the like.

The invention claimed is: 
     
       1. 2-mercaptobenzothiazole manganese zinc, characterized in that the chemical structure thereof is: 
       
         
           
           
               
               
           
         
         wherein m, n and n′ are positive integers, and m=2(n+n′), n≧n′, n:n′=1:1˜9:1. 
       
     
     
       2. A method of preparing said 2-mercaptobenzothiazole manganese zinc according to  claim 1 , characterized in that the steps are as follows:
 (1) preparing the materials according to the stoichiometric ratio of the target products; 
 (2) dissolving 2-mercaptobenzothiazole in sodium hydroxide solution; 
 (3) successively adding an aqueous solution of water-soluble manganese salt and an aqueous solution of a water-soluble zinc salt under stirring to the solution of 2-mercaptobenzothiazole sodium, followed by stirring for mixing well, then the solution being allowed to stand, filtered, washed with water and the filter cake being obtained, wherein the water-soluble manganese salt is one or more selected from the group of manganese sulfate, manganese chloride, manganese nitrate and manganese acetate, while the water-soluble zinc salt is one or more selected from the group of zinc sulfate, zinc chloride, zinc nitrate and zinc acetate; 
 (4) drying the filter cake in vacuum to obtain 2-mercaptobenzothiazole manganese zinc.